SHAMROCK -4-

Oil · District 10 · Lease #30755

Operator: NORTHSTAR OPERATING COMPANY

Cum Oil

2k BBL

Cum Gas

0 MCF

Wells

1

Production

1993-01 — 2010-02

Peak Month

1993-04

Production History

Cum Oil: 1,527 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

26 BBL/mo

Di (annual)

23.7%

b-factor

0.0

EUR

1,274 BBL

R-squared

0.525

type

exponential

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1MWJ PRODUCING COMPANY110,5001984-12-18
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